Please
download System Repair Engineer.
1. Extract it to Desktop & double click SREng.exe to run it
2. Select 'Smart Scan' &
tick "Verify Digital Signatures"
3. Click on the [Scan] button
4. When finished, click on the [Save Reports] button & save the log to Desktop
5.
Attach the log in your next reply. Don't post it.
You may have to rename SREngLOG.log to SREngLOG.txt to upload it.